4" Purple and Green Ridged Self Watering Planter Keep moisture loving plants alive and thriving with minimal attention year round--perfect for homes The outer pot holds enough water to keep a plant alive for one to three weeks--long enough to keep y Ideal for such plants as: African Violets, Asparagus Fern, Boston Fern, Christmas Cactus, Chrysanthe Outer pot is fully glazed inside and out to protect furniture from leakage and sweating.